[patch] fix 2 (#23)

Author: mmisty

src/bin/cy-grep.js

@@ -237,11 +237,19 @@ try {
   let specPattern = getSpecPattern(fileSpecPatternOriginal);
   let specString = getSpecPatternVar(specPattern, grep, onlyRun);
 
-  if (process.env['CYPRESS_GREP_failOnNotFound'] === 'false' && specString === 'CYPRESS_SPEC_PATTERN="[]"') {
-    console.log(`${packagename} Not found any specs matching ${grepExpression}`);
-    console.log(`${packagename} To throw error when not found set CYPRESS_GREP_failOnNotFound to true`);
-    console.log(`${packagename} FINISHED (exit code: 0) === `);
-    process.exit(0);
+  if (process.env['CYPRESS_GREP_failOnNotFound'] === 'false') {
+    if (prefilterFile && existsSync(prefilterFile) && JSON.parse(readFileSync(prefilterFile)).tests?.length === 0) {
+      console.log(`${packagename} Not found any specs matching ${grepExpression}`);
+      console.log(`${packagename} To throw error when not found set CYPRESS_GREP_failOnNotFound to true`);
+      console.log(`${packagename} FINISHED (exit code: 0) === `);
+
+      if (!onlyRun && !onlyPrefilter && deletePrefiltered && existsSync(prefilterFile)) {
+        rmSync(prefilterFile);
+      }
+      process.exit(0);
+
+      return;
+    }
   }
 
   console.log(`${packagename} Running tests === `);